Brush-holder.



No. 769,599. PATENTED SEPT. 6, 1904.

W. L. R. EMMBT. BRUSH HOLDER. APPLICATION FILED DEC. 22. 1900. 30 MODEL.

Jnventor WiHiamL. Rfimmet M QaL J tty.

UNITED STATES Patented September 6, 1904.

PATENT OEEIcE.

WILLIAM L. R. EMMET, OF SOHENEOTADY, NEIV YORK, ASSIGNOB TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEIV YORK.

BRUSH-HOLDER.

SPECIFICATION forming part of Letters Patent No. 769,599, dated September 6, 1904.

Application filed December 22, 1900. Serial No. 40,763. (No model.)

To all, whom, it 777/07 concern: I

Be it known that I, \VILLIAM L. R. EMMET, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in BrusliI-Iolders, of which the following is a specification.

This matter relates to improvements in brush-holders for electric machines.

The improvements consist in novel means whereby a brush can be removed from the holder without altering the tension of the adjusting-spring for the brush and whereby the component parts of the holder may be cheaply manufactured and assembled.

Of the drawings;F-igure 1 is a side elevation of a brush-holder embodying the improvements hereinafter described and a brush therein shown in engagement with a commutator Z of the electric machine. Fig. 2 is a front elevation of the same brush-holder. Fig. 3 is an end view of a sheet-metal punching which is secured to the main part of the brush-holder and is adapted for the retention of the brush-box. Fig. 4C is a front view of the same. Fig. 5 is a rear elevation of a brushbox made, preferably, of a sheet-metal punching and adapted to be mounted on the part shown in Figs. 3 and 4:. Fig. 6 is a plan of the same. Figs. 7 and 8 are a side elevation and bottom view, respectively, of a device which engages the top of the brush and retains the lower end of the adjusting-spring; and Fig. 9 is a plan of an independently-constructed device which is adapted to be removably secured to the main part of the brushholder and to carry the adjusting-spring for the brush.

One object of the invention is to provide an effective spring carrying device which can be readily removed from the brush-holder to permit the removal of the brush. It is a fact now recognized by those skilled in the art that in most instances brush-holders should be so constructed that the brush can beremoved without altering the tension of the adjusting-spring, as after the springs are once adjusted they exert a substantially uniform pressure during the life of the brush, and it is undesirable to permit the varying of this adjustment by the unskilled persons generally employed for the purpose of removing and replacing brushes when they become worn or defective.

In the drawings the main portion of the brush, or whatishereinafter called the holder, is represented by 1 and is provided with any suitable means well known in the art by which it can be secured to a suitable support as, for instance, the clamping-ring and bolt shown. A guide or box for the brush (shown in Figs. 5 and 6) is punched from sheetmetal and bent to the required shape, being provided with lateral holes K. In assembling, this box is secured to the strip shown in Figs. 3 and 4 by the lugs G of the latter, which extend through the holes K and are secured therein in any suitable way, as by causing the lugs Gr themselves to serve as rivets. The recess J permits free movement of the flexible brush connection R. \Vhen the brushbox J is thus secured to the strip E, the latter is secured to the main part 1 of the brushholder in the manner shown in Fig. l, the upper lug F being bent into the recess D in the upper part of the holder 1 and the lower lug H being bent into the recessI in the lower part of the holder 1. By this means the brushbox structure and the part 1 are prevented from relative vertical or horizontal movement.

A bolt B is pivoted in the recess D in the upper portion of the holder 1 and is adapted to be moved freely to the left and right from the position shown in Fig. 1. The device shown in Fig. 9, which is provided with a groove M on its bottom portion and with a slot L,is adapted to carry the adjusting-spring for the brush and to be removably mounted on the top of the holder 1. The bolt B engages in the slot L, and a screw O, working on the bolt B, secures the device A to the holder 1. Portions M extend upward from the strip E and engage in the groove M to prevent the withdrawal of the device A until the screw C shall have been moved upward l and a projection from the holder which ensufliciently to permit the device A to be lifted out of engagement with the parts M.

As shown in Fig. 2, a screw WV works in a threaded hole in the device A, and loosely mounted upon this screw is a spring-carrier T, having downward'ly-projecting rods U, which support the springs and increase their rigidity to keep them from buckling. hen the screw W is moved downward through the device A, the carrier T is forced downward, thus compressing the spring and increasing its pressure upon the brush. In engagement with the brush and supporting the lower. end of the spring is a device (shown in Figs. 7 and 8) which consists of a strip V, up through the lower side of which are inserted screws X, having unthreaded extensions. The turns of the spring engage with the screwthreads to hold the end of the spring in place. In Fig. 9 are shown the holes N in the device A for the springs S and the hole 0, which is threaded for the reception of the screw TV.

The device A is provided with an upward projection Q, in which is inserted the screw Q for securing the end of the flexible connection or pigtail extending from the brush Y.

When it is desirable to remove the brush from the box J, the screw C is turned upward a suflicient distance to permit the raising of the device A away from the parts M, when, owing to the compression of the helical springs'S and the pivotal movement of the bolt B, or each of them, the device A can be entirely removed from the holder and simul taneously therewith the brush Y, which is secured to the device A by its flexible connection R. The adjusting-screw W is not disturbed during this operation nor in the reverse operation, whereby the parts resume their operative positions.

hat I claim as new, and desire to secure by Letters Patent of the United States, is-

1. The combination with a holder provided with a guide for the brush, of a spring, and a device for carrying the spring, which device is removably mounted on the holder independent of said guide and provided with means for adjusting the spring independently of the holder. I

2. The combination with a holder, of a spring, and an independent device for carrying the spring, which device is removably mounted on the holder and is provided with {means for the attachment of the flexible brush- 3. The combination with a holder, of a spring, an independent device for carrying the spring, which device is removably mounted on the holder and is provided with a groove,

gages the groove to prevent relative movement of the holder and said device.

4. The combination with a holder, of a spring, an independent carrying device removably mounted in the holder and provided with a slot extending in the direction of removal, a bolt fixed to the holder and extending through the slot, and a screw working on the bolt and holding the carrying device to the holder.

5. The combination with a holder, of a spring, an independent carrying device removably mounted on the holder and provided with a slot, a bolt pivoted to the holder and extending through the slot, and a screw working on the bolt and holding the carrying device to the holder.

6. The combination with a holder, of an independently-constructed brush-box provided with holes, and projections carried by the holder which extend through the holes, to secure the box in position.

7. The combination with a holder, of a strip secured thereto, an independently-constructed brush-box provided with holes, and projections from the strip which extend through the holes to secure the box in position.

8. The combination with a holder provided with an upper and a lower recess, of a brushbox which is secured to the holder by projections which have been bent into said recesses, whereby all relative movements of the holder and the box are prevented.

9. The combination with a brush -holder provided with a guide-box for the brush, of a helical spring adapted to bear upon the brush, a device for carrying the spring in line with the brush which is movably mounted on a holder independently of the box so that the spring can be readily moved to permit the withdrawal of the brush from the box, and means for adjusting the tension of the spring without varying the positionof the device.

10. The combination with a brush-holder provided with a guide-box for the brush, of a helical spring adapted to bear upon the brush, a device for carrying the spring in line with the brush which is movably mounted on a holder independently of the box so that the spring can be readily moved to permit the withdrawal of the brush from the box, and means carried by the device for adjusting the tension of the spring.

In witness whereof I have hereunto set my hand this 21st day of December, 1900.

TVILLIAM L. R. EMMET. Vitnesses:

BENJAMIN B. HULL, FRED Russ. 

